The end of third season has cleared the way for the fourth season. The last episode of Merlin Season 3 will air on December 4, 2010 and it is expected that season 4 of Merlin will be started in 2012 in the United States. Merlin season 4 includes 10 new episodes of forty-five minute.
Merlin Season 4 trailer (Fan made only/quite interesting)
